Electrically-actuated safety device for elevators.



No. 657,892. Patented sept. n, |900. N. B. KEYSER. ELECTRICALLY ACTUATED SAFETY DEVICE FOR ELEVATURS.

(Application filed Oct. 29, 1897.)

(No Mudel.)

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NiTED S ATES PATENT OFFICE.

NELSON KEYSER, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO MARCUS B. MAY, OF WINCHESTER, MASSACHUSETTS.

ELECTRlCALLY-ACTUATED SAFETY DEVICE FOR ELEVATORS.

sPEciFicArIoN forming part of Letters Patent No. 657,892, dated september 11, 1900.

Original application il'ed October 17, 1893, Serial No. 488,397. Divided and this application filed October 29, 1897. Serial No. 656,779'. (No model To @ZZ whom, it may concern:

Be it known that I, NELSON B. KEYSER, a citizen of the United States, residing at Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented certain new and useful Improvements in Electric- 'ally-Actuated Safety Devices for Elevators; and l do declare the followingto be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the saine, reference being had to the accompanying drawings, and to the letters of reference marked thereon, Which form a part of this specification.

This invention has relation to elevators, and more particularly to that class employed in carrying passengers from one floor to another in a building.

The object of the invention is to provide against accident to the passengers or to the attendant by automatically placing the motor-controlling means out of the control of the attendant while the door leading into the elevator-well is open.

To this end the invention consists of the improvements which I have illustrated on the drawings and which I shall now describe in 1 detail, and then point out with particularity in the claims hereunto annexed.

Figure 1 shows in perspective view an elevator equipped with my invention. Fig. 2 represents in detail the circuit-closing devices. Figs. 3 and 4 show in detail the means on the car for looking the controlling means against movement.

Referring to the drawings, Aindicates the elevator car, movable between the guides A A.

B indicates the door, which may be moved backward to permit entrance to or exit from the car when its floor has reached a level with the landing.

C indicates the ordinary caging inclosing the elevator shaft orwell, upon which and in proximity to each door is arranged a pair of contact-strips I J, suitably insulated from each other, the contact-strip J of each pair being connected by a branch with the main electric circuit L, which includes a battery or suitable generator G, a wire in the hose F, which is conventionally illustrated, connected with the car, and a spring contact-piece H, mounted upon the car and arranged tocontact with the contact-strip I when the carloor has reached a level with the landing. Upon one edge of the door, at the top thereof, is secured a metallic post K, which is adequate in width to enter between the contactstrips I and J and make an electrical contact with each to close the circuit through them, the said contact-strips being mounted upon spring-supports, so that they may separate slightly when the post K enters between them.

The motor-controlling line P, which is of the class known as standing lines, passes through the car and is connected in any suit able way with the motor. Secured upon the inner wall of the car is a bracket Z, having pivoted thereto at m alevern. The lever and the bracket constitute clamps to engage the controlling-line Pand connect it iixedly to the car to'stop the travel thereof, as wil-l be eX- plained. The end q of the lower lever it constitutes an armature for the electromagnet r in the electric circuit L, before referred to, there being a spring o, which tends to hold the members of theclamp usually separated. When one of the elevator-doors is opened, however, the electromagnet is actuated to draw the clamps together, and thereby grip the controlling-line to the car. From the description thus given it will be seen that the opening of the door causes the gripping ofthe rope t0 the car to either prevent the car from being started or else to eect its immediate stoppage. Of course it will be understood that I do not always make the contact H of the same length as it is shown on the drawings, for it may extend the entire length of the car, this being within the judgment of the mechanic installing the apparatus. In any event the car will be brought to a standstill by one of the doors being opened as soon as the circuit is closed through the magnet.

In the operation of the apparatus as thus described the battery or generator serves as a source of energy from which power is coning, prevent the transmission of power from4 the said source to the locking mechanism eX- cept when the car is approximately opposite( a landing and the door is open.

This application is a division of my applj- (laation, Serial No. 488,397, iiled October 17,

Having thus explained the nature of the invention and described a way of constructing and using the same, I now declare that what I claim isl. In an elevator, a motor-controlling device, a door, and mechanism operable only when the car is opposite said door and said door is open, foractuating said device to automatically stop the travel of the car, said mechanism including a source or power, and also including' door-controlled means for conveying power from said source to cause the actuation of the motorcontrolling device.

2. In an elevator, a motor-controlling device, a door, and mechanism operable only when the car is opposite said door and said door is open, for actuating said device to automatically stop the travel of the carsaid mechanism including a lock on the car, a source of power, and flexible means for conveying power from said source to said lock.

3. In an elevator, a door, a motor-control# lingA device, and an electric circuit including' an electromagnetic lock on the car for said device by means of which the car will be yautomatically stopped, and also including independent circuit-'make-and-break devices, one adjacent the door and one on the car.

4. In an elevator, the combination of a plu; rality of doors at the landings, a motor-controlling device, and Ameans for automatically operating saiddevice to stop the travel of the car, said means including an electromagnetic lock on said car in operative relation to said device, and mechanism for establishing a complete and independent circuit at each landing when the elevatorcar is opposite thereto, and the door at said door-landing is open.

In testimony whereof I affix my signature in .presence of two Witnessesi NELSON B. KEYSER.

Witnesses:

MARCUS B. MAY, J. F. HARTMANN. 

